Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20dbefb3af417ec…

MALICIOUS

PDF

48.6 KB Created: 2021-06-04 00:38:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a4539df3a83622c39f87555058c99c70 SHA-1: d7fb248f87a562f2646f51eaf49b2d9b8c647f17 SHA-256: d20dbefb3af417eca2e12f82b91ff6a4d0fdf3015e2a55bb512841c6b37cb9e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link disguised as a download for a 'Coin Master Hack'. The ML classifier flagged this PDF with high confidence, and an external URI heuristic confirms the presence of a suspicious URL. The document body, though partially corrupted, contains text related to the lure and the malicious URL, suggesting a social engineering attempt to trick users into visiting a site that likely hosts malware or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/coin-master-hack-without-verification-or-downloading-apps-game-hack In PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005140.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5140 24732 bytes
SHA-256: 7d2d7e68754f4d9ef70ce6990f9f4f3cc9db2ef57e5fb57bf1e0333fc5da56c6
font_01_sfnt_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off000097da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97DA 19400 bytes
SHA-256: 7055c0b927c5b3f5d83892c818414459ed7060aca91a64b83b2bd90b5073d3c7

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